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You'll find that most of the guitars in this song (or any Katatonia song) use plenty of delay and/or reverb, so adjust your sound accordingly.
The flange-affected guitar in the bridge might not me a guitar, it could simply be electronics/keyboards. In any case, a clean guitar with heavy flange will replicate the sound nicely. Remember to tune down 1/2 a step and have fun with this great song...
I'm not sure whether a five-string bass is used in this song or whether a standard bass is sumply tuned Drop D. Photo evidence indicates a four stringer, but the tuning would then be inconsistent with the EADGBE tuning of the guitars. I've tabbed it for four strings, because that's what most bass players have, and it's simple enough to be adapted either way.